Scale-preventer for boilers.



J. W. STEPHENS. SGALE PREVENTER r01: BOILERS.

' AYPLIUATION FILED NOV. 20, 1909. 973,9 9, Patented 0 :15.25, 1-910.

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'INVENTOR /0hw W. STEP/ ENS ATTORNE Y8 RS cm. WASHINGTON, 0. 2:4

WITNESSES ki f Y 'J. W. STEPHENS. SCALE PREVENTER FOR BOILERS.

Patented Oct. 25, 1910.

9 APPLICATION FILED NOV. 20, 1909.. 973,989.

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w/mEssm INVENTOR /ohw Ml STEPHENS ATTORNE Y8 JOHN W. STEPHENS, 0F STAUNTON, VIRGINIA.

SCALE-PBEVENTER FOR BOILERS.

Specification of Letters Patent.

Patented Oct. 25, 1910.

Application filed November 20, 1909. Serial No. 529,053.

To all whom it may concern:

Be it known that I, JOHN W. STEPHENS, a citizen of the United States, and a resident of Staunton, in the county of Augusta and State of Virginia, have made certain. new and useful Improvements in Scale-Preventers for Boilers, of which the following is a specification.

My invention is an improvement in scale preventers for boilers, and consists in certain novel constructions and combinations of parts, hereinafter described and claimed.

The object of the invention is to provide a device for separating sediment and sediment producing salts from the feed water before it is admitted to the boiler proper, by preliminarily heating the feed water within the boiler passing it through a plurality of settling tanks and a skimming tank, removing the sediment from the boiler, filtering it and returning the purified water to the boiler.

Referring to the drawings forming a part hereof-Figure 1 is a side view of a boiler with the improvement in place, a part of the boiler being broken away. Fig. 2 is a plan view of Fig. 1. Fig. 3 is a section on the line 38 of Fig. 2, and Fig. a is a section on the line 4.4c of the same figure.

As is well known, when water containing sulfates, carbonates, etc., is heated toa high temperature, the salts are precipitated, and the resulting precipitate forms the scale on the boiler tubes and boiler, acting as an insulator and impairing the efficiency of the boiler. The embodiment of the invention shown in the drawings is intended to prevent this action by separating the salts from the water, collecting them and removing them from the water and the boiler. WVith this object in View, the feed water is introduced through the front end of theboiler 1, by means of a pipe 2, and is delivered into a separator to be presently described in detail, arranged at the rear end of the boiler.

The separator comprises an open top casing 3 havingat each end near the top a lateral flange 4, to which is bolted by bolts 5 the body portion 6 of a yoke-shaped bracket. The arms 7 of the bracket are provided with bearing rings 8, bolted to the arms by bolts 9, and each ring encircles a boiler tube 10, thus securing the separator in place. It is obvious that the casing may be supported in any suitable manner, depending on the form of the boiler, and it is made large or small to correspond with the size of the boiler.

The casing is provided with two transverse partitions 11 and 12 which divide the casing into three compartments, and the rear compartment is further sub-divided by partitions 13 and 14 into three compartments, making five compartments in all, designated A, B, C, D, and E, respectively. The inlet pipe 2 extends rearwardly, and communicates with the chamber A at one side and near its top by a lateral extension 15.

The bottom of the casing is hopper or V- shaped as shown more particularly in Fig. 3, and a discharge pipe 16 is arranged longitudinally of the bottom,'the said pipe extending forwardly through the partition 12, and extending rearwardly to a point adjacent the rear head of the boiler, thence upwardly and out of the boiler as at 17, rearwardly as at 18, and downwardly as at 19 to a con nection with a filter to be presently described, and a valve20 is interposed in the portion 18 of the pipe.

The pipe 16 is provided in the chamber 0 with 'a plurality of lateral openings 21, and extends into a sleeve 22 which traverses the partition 12. Both of the partitions 11 and 12 are of lesser height than the walls of the casing as will be evident from an inspection of Fig. 1. The compartment A is provided with a plurality of vertical tubes 23, extending at their bottoms through the bottom of the casing, and having their tops approximately level with the top of the casing.

The compartments D and E are similar and similarly shaped, and such is provided with a lateral overflow pipe 24, opening from the compartment near its top, and having at its outer end a downwardly curved portion 25. The partitions 13 and 14;; are also of lesser height than the walls of the casing.

The compartment C as shown in Figs. 2 and 3 is substantially triangular in shape with its apex to the rear, and the compartment is covered by a shield or hood 26 which is substantially semi-conical in shape and is arranged with its large end toward the front and connected to the pipe 16 at the rear. All three of the compartments C, D and E, communicate with the pipe 16 through the openings 21 in the said pipe.

The separator is practically a settling device. hen the feed water enters. the compartment A, the flow is checked by the partition 11, until the water is high enough to pass thereover, and the settling is assisted by the tubes 23, which offer an. obstruction. to the flow of the water. The feedwater begins to be heated. as soon as it enters the boiler, and the tubes 23 assist in the heating,

permitting the heat to pass through them,

and sub-dividing the water, so that a larger amount 1s. brought 1nto contact with the heated pipes. The feed; water fiOWing over hood or shield 26 acts as a skimmer for this scum, skimming 1t oif and passing it down.

intothetube 16, while the skimmed water passes into't-he side compartmentsDand E.

A portion ofthe feed water is discharged from the compartments D and E into: the boiler, and the remainder passes with. the

sediment through, the sections 17, 18 and 1-9' ofthedischarge pipe into the filter, which comprises a substantially cylindrical casing 27, arranged near the rear end of the boiler and supported. on a bracket 28.

The casing 27 is provided with acover 29,

having a flange 30, which rests upon a flange 31 onthe casing, and. the-fiangesare secured together by rivets 32, the pipe 19 passingthrough the cover. The casing F ig. 4) comprises. a. compartment G and a compartment H, the latter being spaced; above the bottom of the casing, and thesaidcompartments. are separated by a, walL comprising a vertical portionv 33, anch a horizontal portion 34, the latter having a plurality ofopenings. 35- therethrough.

A return pipe36 leadszf rom the upper endof the compartment H} through; the cover 29 and; communicates with the rear end of. the boiler near its bottom as at 37, and a valve 38 is arranged in the said pipe. The cover isv provided with nipples 39, and the pipes 19 and 36 are threaded into the nipples, as shown: in Fig. 4. The compartment H is also provided with a suitable filtering material 40, such. as. charcoal or the like, and the compartment 6' with a blow: off pipe 41 inthe bottom of the casing provided with. a vallve=42.

The Water and sediment passing from the separator through the pipes 16, 17., 18 and 19' under pressure from the boiler flows downwardly into the compartment G of the filter, upwardly through the: openings 35, through the filtering material: 40, andis returned to the lower partof the boiler, free asses;

from sediment forming salts, and somewhat cooled by its passage through the filters, the cooling assisting in the circulation. When the compartment G contains too much sediment, it may be blown off by opening the valve 42.

The pipe 41 has a capacity equal to the aggregate capacity of the pipes 19 and 36,

in order that the blowing off may be thorcut. oft from the circulation by closing the said valves, for cleaning or other purposes.

The separator is. preferably constructed of a plurality of sections secured together in any suitable manner, and is supported above or at the normal level of the water. The hood or shield. is arched being: substantially asemi-conical shell. arranged. with its large end toward the direction in which the feed water flows, so that the sediment strikes the inner face of the shell. and is deflected toward the bottom of the compartment.

The shield is in effect an arched bafiie plate inclined. toward the direct-ion of travel of the water, and the partitions are sub stantially vertical. baffle plates. The vertical tubes act as baiiles, as do also the inclined bottom. walls of the casing.

I claim:

1. The combination with. the boiler, of a. separator comprising a casing having an open top: and. a trough shape bottom, a plurality of spaced transverse bafiie plates. of lesser height than: the casing walls, dividing the casing intoa' front, an intermediate and a rear compartment, a feed water pipe de livering to the front compartment, a plurality of substantially vertical tubes extend ing upwardly through the bottom of the casing in. the front compartment, a discharge pipe in the bottom and leading from the intermediate compartment through the rear compartment and outside of the boiler. aplurality of substantially longitudinal baffle plates of lesser height than the casing wall dividing the rear compartment into a central and side compartments, a. skimming device inthe said central compartment, over-flow pipes leading from the side compart-ment to the boiler, said discharge com.- municatingwith said central and side compartments, a filter outside the boiler to which the discharge pipe delivers, and a return pipe leading from. the filter to the boiler.

2; Ina device of the character spccified,a

separator provided with means for supporting the same Within a boiler above the normal water level, said separator comprising a casing having an open top, a plurality of transverse baflie plates of lesser height than the walls of the casing dividing said easing into a plurality of compartments, a feed water pipe delivering to the front compartment, a plurality of substantially vertical tubes extending through the bottom of the front compartment a discharge pipe in the bottom leading from the intermediate compartment, a plurality of substantially longitudinal baffle plates dividing the rear compartment into central and side compartments, a skimming device in said central compartment, the discharge pipe communicating with said central and side compartments and leading from the boiler, an overflow pipe leading from each of the side compartments and delivering into the boiler a filter to which the discharge pipe delivers, and a pipe leading from the filter to the boiler.

3. In a device of the character specified, a separator, comprising a casing having an open top, and adapted to be supported in a boiler above the water level, baflie' plates of lesser height than the casing walls dividing said easing into a plurality of compartments, a feed water pipe delivering to the front compartment, a plurality of substantially vertical tubes extending through the bottom of the front compartment, a plurality of substantially longitudinal batfle plates dividing the rear compartment into a central and side compartment, over-flow pipes leading from the side compartments, a skimming device in the central compartment, and means for removing the sediment from the casing.

4. In a device of the character specified, a separator comprising an open top casing, transverse bafile plates of lesser height than the casing dividing said casing into a plurality of compartments, a feed water pipe delivering to the front compartment, a skimming device in another of the compartments, baflie plates in said compartment, over-flow pipes leading therefrom, and means for conducting the sediment from the casing.

5. In a device of the character specified, a separator comprising a casing adapted to be arranged in the boiler above the water level, a plurality of baffle plates in the casing, overflow pipes leading from the top of the casing, a filter, and means for removing the sediment from the casing and passing it through the filter.

6. In a device of the character specified a casing, a plurality of substantially vertical bafiie plates in the casing, a substantially horizontal transversely arched bafiie plate, one of whose ends is lower than the other, means below said baffle plate for removing the sediment from the casing, and overflow pipes at the level of said plate.

7. In a separator of the character specified, a casing having at one end a substantially V-shaped compartment, an arched shield or hood over the compartment the arch of the said shield gradually decreasing in height toward the apex of the compartment, means for feeding water to the opposite end of the casing and means below the hood for removing the sediment.

8. The combination with the boiler of an open top casing supported'within the boiler above the normal water level, partitions of lesser height than the casing walls dividing said casing into a plurality of compartments, a feed water pipe delivering to the casing, a filter outside of the boiler, a valved blow off pipe in the bottom of the filter, a pipe leading from the filter to the boiler below the water level, and a plurality of overflow pipes leading from the casing to the boiler.

9. The combination with the boiler of an open top casing supported within the boiler above the normal water level, partitions of lesser height than the casing walls dividing said easing into a plurality of compartments, a feed water pipe delivering to the casing, a filter outside of the boiler, a pipe leading from the separator to the filter, a pipe leading from the filter to the boiler below the water level, and a plurality of overflow pipes leading from the casing to the boiler.

10. The combination withv the boiler, of a casing supported in the boiler above the normal water level, a feed water pipe delivering to the casing, a plurality of overflow pipes leading from the casing to the boiler, said casing having a plurallty of settling compartments, a filter outside of the boiler, means for conducting a portion of the water and the sediment from the casing to the filter, and means for returning the filtered water to the boiler.

11. In a device of the character specified, a' separator com rising a casing having an open top means or supplying feed water at oneend thereof, a plurality of substantially vertical transverse baflie plates spaced apart from each other in the casing, a plurality of substantially longitudinal baflie plates at the opposite end of the casing, and an arched baflie plate intermediate the last named plates, said plate being inclined and arranged with its concave side downward, and means below said plate for removing the sediment.

JOHN w. STEPHENS.

Witnesses WM. H. As'r, Bnssm H. CRAWFORD. 

